Fire-arch for boilers



(No Model.)

R. PATRICK.

FIRE ARGE PoR BoILBRs.

No. 341,048; Patented May 4, 1886.

In @mk www Nrrnn STATES PATENT OFFICE.

ROBERT PATRICK, OF BRAINERD, MINNESOTA.

FIRE-ARCH FOR BOILERS.

SEECIFICATION forming part of Letters Patent No. 341,048, datedA May 4,1886.

(No model.)

To all whom t may concern.:

Be it known that I, ROBERT PATRICK, a citizen of the United States, anda resident of Brainerd, in the county of Crow W'ing and State ofMinnesota, have invented certain Improvements in Fire-Arches forLocomotive Boilers, of which the following is a specifica-` tion.

My invention relates to improvements in deflecting-plates or fire-archesfor locomotive fire-boxes; and the invention consists, generally, in ahollow metallic bridge or watertable, in form and position similar tothe ordinary nre-brick arch, and constructed so as to be readily appliedto or removed from the fire-box.

The invention also consists in the construction and combinationhereinafter described, and particularly pointed out in the claims.

In lire-boxes of this class it is found advantageous to place an archunder the tubes, extending diagonally toward the crown-sheet, for thepurpose of partially reverberating the products of combustion andpreventing thein fiammable gases from passing directly through thetubes. The common mode of accomplishing this result has been to form anarch of this description of fire-brick, in two or more sections, andsupported upon the sides of the furnace. The intense heat of the gasesim pinging upon the crown of this arch soon causes it to give way andbecome displaced. I obviate this by making the arch of hollow cast-metalsections, having a circulation of water through them, so that the archis capable of withstanding any amount of heat.

In the accompanying drawings, which form part of this specification,Figure l is a vertical section of a tire-box having my improvementapplied thereto. Fig. 2 is an end elevation and partial section of thesame. Fig. 3 is a plan showing the water connection. Fig. 4 is asection'of my improved arch, showing the interior construction.

2 in the drawings represents the fire-box, surrounded by the water-leg4, inclosed at the bottom by the grate 6, and provided at the back withthe fire-door 8.

10 represents a tire-arch made of cast-iron, and composed of severalhollow sections. I

nd it most convenient to form the arch of three sections, as shown, thecenter section acting as a key to hold the whole in place. Each sectionis preferably cast in one piece, as shown, and the sections arepreferably of the form substantiallyl as shown. The sections may besecured together in any suitable manner. I prefer to form recesses 12 inthe edges of the sections, into which rods 13 are inserted after thesections are put in place.

14 14 are bolts or studs, which support the four corners of the arch,and are tapped into the side sheets of the furnace. To avoid covering alarge surface of the tubesheet, I form the two' outer sections withprojections 17, which rest against the tube-sheet.

19 represents a pipe,which is passed through a tube or thimble in thewater-leg 4., and is tapped or otherwise secured in the center sectionof the iire-arch, and by means of a T- coupling, 20, and the branchpipes 21 it is also connected to the two side sections. The outer end ofthe pipe is also connected with the tank, either directly or through apump or injector.

22 represents a pipe connected to the opposite end or highest part ofthe arch 10. This pipe is connected with each section of the arch, andpasses out through the water-leg of the tire-box, and is carried back tothe tank or is carried directly to the boiler, as desired. A glasswater-gage, 25, may be located upon this discharge-pipe to indicate theposition of the water in the arch.

It will be seen that when the arch is in place in the iire-box, asdescribed, and the connections are made by the pipes 19 and 22, a circulation of water may be kept up through the arch 10, which is thusprevented from burning out, andat the same time the arch may be utilizedas a feed-water heater.

As each section of the arch is cast preferably in one piece, there is nodanger of leakage, and whenever it is necessary the arch may be readilyremoved 'by uncoupling the pipes 19 9 22 and removing the rods 13, whenthe sections can be readily taken apart.

Each section of the arch is preferably provided With an opening, 31, inits end, through which the core may be withdrawn in casting,

and this opening is provided with a plug, 33, which may be removed whenit is desired to Wash out the arch.

I claim as my invention- 1. The combination, with the fire-box, of thefire-arch composed of the cast-metal hollow sections 10, the pipes 19,connected to one end of the arch, and the discharge-pipe 22, connectedto the upper end of the arch, substantially as described, and for thepurpose set forth.

2. The combination, With the fire box,of the nre-arch composed oftheindependent hollow sections 10, means connecting said sections and meansfor supporting said sections, and the inlet and discharge pipesconnected with each section of said arch, substantially as de scribed.

3. The combination, with the lire-box, of the hollow cast-metal sections10, having the recesses 12, the rods 13, inserted in said recesses, andthe studs 14, supporting the corners of the arch and tapped into theside sheets of the furnace, substantially as-described.

4. The combination, with the center section, of the side sections havingthe projections 17, resting against the tube-sheet, the pipe 19,connected with the center section, the coupling 2O and branch pipes 21,connect-ed to the side sections, and the dischargepipe 22, connected tothe highest part of each section, all substantially as described. v

In testimony whereof I have hereunto set my hand this 4th day ofFebruary, 1886.

l ROBERT PATRICK.

In presence of- G. S. FERNALD, L. C. CARLETON.

